Research On The Influence Of Different Magnetic Valve Structure On Magnetic Field Distribution Of Magnetic Control Reactor

Magnetic-valve controlled reactor(MCR) is developed on the basis of the magnetic saturation type controlled reactor. It has the approximate linear volt-ampere characteristics, besides, it has many advantages, for example, low harmonic, small space occupied, low noise, easy maintenance, etc, which has very important practical significance for the optimal control and sustainable of our country's power grid. But as the continuous application of large capacity MCR, the loss problem increasingly prominents. The mechanism of loss is caused by the alternating magnetic field, combining with the special structure of the core, which leads to a big change for flux density values in different core position and the loss of each parts. Optimizing the magnetic field distribution of the core not only can effectively reduce the effects of magnetic flux leakage for itself and its nearby equipments, but also can reduce the loss of core and prolong the operating life of the reactor. Therefore, the research for the magnetic field distribution of magnetic valve controlled reactor has great significance.At first, this dissertation detailed states the working principle of magnetic valve controlled reactor. On the basis of the mathematical model of the magnetically saturation type controlled reactor, the simplified equivalent model of the ac/dc independent control circuit is deduced. To simulate the real saturation magnetization properties under the alternating magnetic field, with the help of ANSYS finite element software, the dissertation approximate fits the measured values.Then, taking rated voltage 220 V, 20 A control current of a magnetic valve controlled reactor as an example, the dissertation designs its core and winding, ect. Through the combination of APDL parametric design language, using ANSYS coupling method, the MCR's equivalent physical model of the 3-D field-circuit coupled simulation model is set up in ANSYS software.Adding load to winding of single-stage magnetic valve core, which is a kind of simple structure, the simulation results show that the magnetic field distribution of core is consistent with the theoretical analysis, which demonstrates the validity of the field-circuit coupled simulation method. Finally, by comparing with the results of simulation of other common four different structures of magnetic valve core in the literature, and adding different load to the wingding, and so that the core in unsaturated, saturated and extreme saturation state respectively. The dissertation finds out that the magnetic valve structure of core has a great influence on magnetic field distribution, by means of the contrast analysis of simulation results that differents magnetic valve structure of core. For more comprehensive analysis the influence that different magnetic valve for leakage flux and core loss, then, the dissertation also compares the simulation results of four kinds of derived structure, on the basis of effectively reducing the magnetic flux leakage and loss, the dissertation finds out an optimal magnetic valve core structure. In the simulation comparison of the nine different structures of magnetic valve core, parallel structure in the form of magnetic valve can effectively reduce the core loss. the simulation method and simulation results provide a certain reference for further study of MCR.